feat(voice): all microphone buttons use the server's speech recognition

- New useVoiceInput hook (lib/voice.ts): "server" records with MediaRecorder
  and sends to /voice/transcribe, "browser" keeps the live recognition,
  "off" or missing browser support hides the microphone.
- Quick dump bar, mobile capture sheet and hold-to-record use it; live
  waves from the real input level (VoiceWave) and "Wird erkannt…".
- Recordings stop after STT_MAX_SECONDS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -23,6 +23,7 @@ import {
   Flame,
   Mic,
   MicOff,
+  Loader2,
   Search,
 } from 'lucide-react';
 import { AuthStatus, DashboardStats, PriorityLevel, SharedList, Thought, User, UserTheme } from './lib/types';
@@ -35,6 +36,8 @@ import {
   disconnectWebSocket,
   isSharingDisabled,
 } from './lib/api';
+import { useVoiceInput } from './lib/useVoiceInput';
+import { VoiceWave } from './components/VoiceWave';
 import {
   AVAILABLE_THEMES,
   customThemeOption,
@@ -175,49 +178,31 @@ export const App: React.FC = () => {
   const [mobileTriageContent, setMobileTriageContent] = useState('');
   const [mobileTriagePriority, setMobileTriagePriority] = useState<PriorityLevel>('normal');
   const [mobileTriageDueDate, setMobileTriageDueDate] = useState('');
-  const [mobileVoiceActive, setMobileVoiceActive] = useState(false);
   const [isVoiceCaptured, setIsVoiceCaptured] = useState(false);
-  const mobileRecognitionRef = useRef<any>(null);
+  const [mobileVoiceError, setMobileVoiceError] = useState<string | null>(null);
   const mobileBaseVoiceRef = useRef('');
+  // Voice input of the mobile capture sheet: own Whisper server or the browser (lib/voice.ts)
+  const mobileVoice = useVoiceInput({
+    onText: (text) => {
+      if (!text) return;
+      const base = mobileBaseVoiceRef.current;
+      setMobileTriageContent(base ? `${base} ${text}` : text);
+      setIsVoiceCaptured(true);
+    },
+    onError: (message) => {
+      setMobileVoiceError(message);
+      window.setTimeout(() => setMobileVoiceError(null), 4000);
+    },
+  });
+  const mobileVoiceActive = mobileVoice.state === 'listening';
 
   const toggleMobileVoice = () => {
-    const SpeechRecognition =
-      (window as any).SpeechRecognition || (window as any).webkitSpeechRecognition;
-    if (!SpeechRecognition) {
-      alert('Spracheingabe wird von diesem Browser leider nicht unterstützt.');
-      return;
-    }
-    if (mobileVoiceActive && mobileRecognitionRef.current) {
-      mobileRecognitionRef.current.stop();
-      setMobileVoiceActive(false);
-      return;
-    }
-    try {
+    if (mobileVoice.state === 'idle') {
       mobileBaseVoiceRef.current = mobileTriageContent.replace(/\s*\[…\]$/, '').trim();
-      const recognition = new SpeechRecognition();
-      recognition.lang = 'de-DE';
-      recognition.continuous = false;
-      recognition.interimResults = true;
-      recognition.onstart = () => {
-        setMobileVoiceActive(true);
-        triggerHaptic(20);
-      };
-      recognition.onresult = (event: any) => {
-        let transcript = '';
-        for (let i = 0; i < event.results.length; i++) {
-          transcript += event.results[i][0].transcript;
-        }
-        const base = mobileBaseVoiceRef.current;
-        setMobileTriageContent(base ? `${base} ${transcript}` : transcript);
-        setIsVoiceCaptured(true);
-      };
-      recognition.onerror = () => setMobileVoiceActive(false);
-      recognition.onend = () => setMobileVoiceActive(false);
-      mobileRecognitionRef.current = recognition;
-      recognition.start();
-    } catch {
-      setMobileVoiceActive(false);
+      setMobileVoiceError(null);
+      triggerHaptic(20);
     }
+    mobileVoice.toggle();
   };
 
   const handleMobileCreateTriage = async (e: React.FormEvent) => {
@@ -249,7 +234,7 @@ export const App: React.FC = () => {
     setMobileTriagePriority('normal');
     setMobileTriageDueDate('');
     setIsVoiceCaptured(false);
-    setMobileVoiceActive(false);
+    if (mobileVoice.state !== 'idle') mobileVoice.cancel();
     setShowMobileCapture(true);
   };
 
@@ -1341,21 +1326,49 @@ export const App: React.FC = () => {
                     autoFocus
                     value={mobileTriageContent}
                     onChange={(e) => setMobileTriageContent(e.target.value)}
-                    placeholder="Was geht dir durch den Kopf?…"
-                    className="w-full input-field px-3 py-2 pr-10 text-sm"
+                    placeholder={
+                      mobileVoiceError
+                        ? mobileVoiceError
+                        : mobileVoiceActive
+                          ? 'Ich höre zu…'
+                          : mobileVoice.state === 'transcribing'
+                            ? 'Wird erkannt…'
+                            : 'Was geht dir durch den Kopf?…'
+                    }
+                    className={
+                      mobileVoiceActive && mobileVoice.mode === 'server'
+                        ? 'w-full input-field px-3 py-2 pr-24 text-sm'
+                        : 'w-full input-field px-3 py-2 pr-10 text-sm'
+                    }
                   />
-                  <button
-                    type="button"
-                    onClick={toggleMobileVoice}
-                    className={`absolute right-1.5 top-1/2 -translate-y-1/2 w-7 h-7 rounded-full flex items-center justify-center transition-colors cursor-pointer ${
-                      mobileVoiceActive
-                        ? 'bg-accent text-on-accent animate-pulse'
-                        : 'text-muted hover:text-main hover:bg-panel-elevated'
-                    }`}
-                    title="Spracheingabe"
-                  >
-                    {mobileVoiceActive ? <MicOff className="w-3.5 h-3.5" /> : <Mic className="w-3.5 h-3.5" />}
-                  </button>
+                  {mobileVoice.available && (
+                    <div className="absolute right-1.5 top-1/2 -translate-y-1/2 flex items-center gap-2">
+                      {mobileVoiceActive && mobileVoice.mode === 'server' && (
+                        <VoiceWave getLevel={mobileVoice.level} bars={7} className="h-4 text-accent" />
+                      )}
+                      <button
+                        type="button"
+                        onClick={toggleMobileVoice}
+                        disabled={mobileVoice.state === 'transcribing'}
+                        className={`w-9 h-9 rounded-full flex items-center justify-center transition-colors cursor-pointer ${
+                          mobileVoiceActive
+                            ? mobileVoice.mode === 'server'
+                              ? 'bg-status-err text-on-accent'
+                              : 'bg-accent text-on-accent animate-pulse'
+                            : 'text-muted hover:text-main hover:bg-panel-elevated'
+                        }`}
+                        title={mobileVoiceActive ? 'Aufnahme beenden' : 'Spracheingabe'}
+                      >
+                        {mobileVoice.state === 'transcribing' ? (
+                          <Loader2 className="w-4 h-4 animate-spin" />
+                        ) : mobileVoiceActive ? (
+                          <MicOff className="w-4 h-4" />
+                        ) : (
+                          <Mic className="w-4 h-4" />
+                        )}
+                      </button>
+                    </div>
+                  )}
                 </div>
               </div>